Observatorio ARVAL

Astro Links

Contenido (Contents):

Use Ctrl-F (Find) para encontrar palabras en esta larga y frecuentemente actualizada página (cerca de 1000 enlaces). Busque por "Castellano" para localizar las páginas en este idioma fuera del área de "Países".

Use Ctrl-F (Find) to find words in this frequently updated long page (some 1000 links).

El Web está hecho de enlaces. Google los cuenta. El rango de una página en el Web (en el Google Toolbar y Google Search) es directamente proporcional a esta cuenta. Enlace hacia sus sitios favoritos desde sus paginas en el Web!

The Web is made of links. Google counts them. The rank of a Web page (in the Google Toolbar and Google Search) is directly proportional to this count. Link to your favorite sites from your Web pages!

Space Telescope Science Institute (STScI):
Space Telescope Science Institute Home Page
STScI Public Information Home Page
Amazing Space (Hubble Space Telescope's discoveries to inspire and educate about the wonders of our universe)
Digitized Sky Survey (MAST DSS)
Exploration In Education (ExInEd)
Faint Images of the Radio Sky at Twenty-centimeters (FIRST) (The VLA FIRST Survey)
Hubble Heritage Project (A photo album of some of Hubble Space Telescope's most stunning views of the universe)
HubbleSite (from the STScI Office of Public Outreach)
HubbleSite presents New Views of the Universe
Hubblesite - Explore Astronomy
 - Black Holes: Gravity's Relentless Pull - Introduction
 - Tonight's Sky (Monthly stargazing guide to constellations, planets, cosmic events and more)
HubbleSite - News Center
HubbleSite - News Release Archive
HubbleSite - Index of Press Releases: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Hubblesite - The James Webb Space Telescope
HubbleSOURCE (Informal Science Education Resources)
Space Science Education Resource Directory

National Aeronautics and Space Administration (NASA):
National Aeronautics and Space Administration Home Page
Alpha Magnetic Spectrometer (AMS-02) (ISS - Launched on May 16, 2011)
Ames Research Center (con servicio de noticias en Castellano)
Aqua Satellite Project Science (Earth's water cycle)
Ask the Space Scientist (Dr. Sten Odenwald)
Asteroid and Comet Impact Hazards (David Morrison)
Asteroids and Comets (Latest news on Comets, Asteroids and Near-Earth Objects)
Astrobiology (Life in the Universe)
 - Astrobiology Institute (NAI) (with e-mail news delivery service)
Astromaterials Research and Exploration Science (ARES)
 - Astrobiology Biomarkers
Astronomy Picture of the Day (Each day a different image or photograph of our fascinating universe)
Aura Atmospheric Chemistry Mission
Beyond Earth: Expanding Human Presence Into the Solar System
Brain Bites (Educational Videos)
Breakthrough Propulsion Physics
Cassini-Huygens: Close Encounter with Saturn
Clouds and Earth's Radiant Energy System (CERES)
Ciencia@NASA (en Castellano)
Chandra X-Ray Observatory
CloudSat Mission
Cosmicopia (Cosmic and Heliospheric Learning Center, Cosmic Rays)
Dawn Mission (Ion Propulsion. Asteroids Vesta and Ceres, from September 2007 to July 2015)
De Astrónomos a Astronaves (Astronomía, mecánica Newtoniana, el Sol, y vuelos espaciales, David P. Stern)
Deep Impact (Mission to impact Comet Tempel 1 in July 4 '05)
Discovery Program (Planetary science explorations, Marshall Space Flight Center)
Distributed Information Services for Climate and Ocean Products and Visualizations for Earth Research (DISCOVER) (Long-term ocean and climate data records)
Dryden Flight Research Center
Earth Observatory
Earth Observing System (EOS) (Project Science Office)
Earth Observing-1 (EO-1) (Advanced Land Imaging)
Earth Science Office (Marshall Space Flight Center)
EPOXI Mission (Flyby of Comet Hartley 2 in November 4, 2010)
Fermi Gamma-ray Space Telescope (June 11, 2008)
Fourth Convection And Moisture EXperiment (CAMEX-4) (Marshall Space Center Hurricane Study)
From Stargazers to Starships (Astronomy, Newtonian mechanics, the Sun, and spaceflight, David P. Stern)
Gamma Ray Astrophysics at the NSSTC Burst and Transient Source Experiment (BATSE), GLAST Burst Monitor (GBM)
Goddard Institute for Space Studies (GISS)
Goddard Space Flight Center (GSFC)
Gravity Probe B (The Relativity Mission)
Gravity Recovery and Interior Laboratory (GRAIL) [from Jan. 1 2012]
Heliophysics Division (Sun-Earth Connection)
High Energy Astrophysics Science Archive Research Center (HEASARC)
Hinode (SOLAR-B) Mission (Exploring the magnetic fields of the Sun) [from 22 Sep. 2006]
History Division
Hubble Space Telescope
Human Space Flight (HSF) [NASA-TV, Shuttle, International Space Station (ISS)]
 - SkyWatch (Satellite Observation Java applet)
 - The Apollo Program History (Humans on the Moon)
Hurricane Resource Page
Imager for Magnetopause-to-Aurora Global Exploration (IMAGE)
Intelligent Systems Division (Ames Reseach Center)
International Space Station (ISS)
International Year of Astronomy 2009
Interstellar Boundary Explorer (IBEX)
Introduction to Big Bang Cosmology (WMAP Website)
James Webb Space Telescope (JWST) (from 2018)
Johnson Space Center (JSC) (Houston, Texas)
J-Pass - Satellite Passes [Java]
J-Track - Satellite Tracking [Java]
J-Track 3D - Satellite Tracking [Java]
Kennedy Space Center (KSC)
Kepler Mission (A Search for Habitable Planets)
 - Johannes Kepler (His Life, His Laws and Times)
La Tierra, el Gran Imán - Sobre el Magneto, William Gilbert (David P. Stern, en Castellano)
Landsat Program (Earth-observing satellites)
Landsat Image Mosaic of Antarctica (LIMA)
Langley's LIDAR Applications Group
Lightning and Atmospheric Electricity at the GHCC
Lunar and Planetary Science at the NSSDC
Lunar Atmosphere and Dust Environment Explorer (LADEE) (100-day science mission. Launch 23:27 EDT Sept. 6, 2013)
Lunar Crater Observation and Sensing Satellite (LCROSS) (South Pole impact, October 9 '09, indicates Water on Moon)
Lunar Prospector
Lunar Reconnaissance Orbiter (LRO) (June 18 '09)
Mariner Mars Missions
Mars Atmosphere and Volatile Evolution Mission (MAVEN) (Nov. 18, 2013)
Mars Exploration Program Landing Sites (Marsoweb interactive data maps)
Mars Exploration Rovers (Spirit and Opportunity)
Mars Reconnaissance Orbiter (MRO)
Mars Science Laboratory, the Next Mars Rover (Curiosity. Launched Nov. 26 '11, Arrival 01:31 EST, Aug. 6 '12)
Marshall Space Flight Center
MESSENGER Mission (Mercury Surface, Space Environment, Geochemistry and Ranging)
Mini-RF (2 radar instruments on the Moon)
Moderate Resolution Imaging Spectroradiometer (MODIS)
NASA Earth Observations (NEO) (Imagery: Ocean, Atmosphere, Energy, Land, Life)
NASA Eclipse Web Site (Solar and Lunar eclipse information)
NASA Education
NASA en Español (Java y Flash Macromedia)
NASA Image Exchange (NIX)
NASA/IPAC Extragalactic Database (NED)
NASA Learning Technologies (NLT)
NASA Missions
NASA Multimedia
NASA Quest (Interactive explorations, an educational Website)
NASA Science (Earth, Heliophysics, Planets, Astrophysics)
NASA Worldview (EOSDIS)
National Space Science Data Center (NSSDC)
 - NSSDC Multimedia Catalog
 - NSSDC Photo Gallery
 - NSSDC Planetary Catalog of Spaceborne Imaging
New Horizons Mission (Pluto and Charon - Kuiper Belt Objects, 2006-2015-2020)
Phoenix Mars Lander Mission (Underground water, 4 August 2007 - 25 May 2008)
Pioneer Mission
Planck Space Telescope (ESA & NASA) (launched 14 May 2009)
 - Planck Mission Brings Universe Into Sharp Focus (March 21 2013)
Polar, Wind, and Geotail Missions (Sun-Earth Connection)
Precipitation Measurement Missions (An international partnership to understand precipitation and its impact on humankind)
Project Radio Jove (Amateur Jupiter Radio-Astronomy)
Remote Sensing Tutorial (RST) (Dr. Nicholas M. Short)
Rapid Response - EOSDIS
Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)
SAO/NASA Astrophysics Data System (ADS) (Harvard-Smithsonian/NASA Digital Library for Astronomy, Astrophysics, and Physics)
Science@NASA Headline News
Scientific Visualization Studio (SVS) (Goddard Space Flight Center)
Shuttle Online Press Kits (Shuttle mission information)
SkyView (The Internet's Virtual Telescope)
Solar and Heliographic Observatory (SOHO) (ESA & NASA)
Solar Data Analysis Center (SDAC) (Goddard Space Flight Center)
Solar Dynamics Observatory (SDO) [January 2010]
Solar Physics (Marshall Space Flight Center)
Solar Probe Plus [First visit to the Sun, 2014]
Solar System Exploration
 - Deep Space 1 (DS1) (Ion Propulsion and Advanced Technologies Demonstrator. Launched on October 24 '98, encounter with Comet Borrelly in Oct. '01, mission ended on Dec. 18 '01)
 - Galileo Legacy Site (Jupiter Mission, Oct. 18 '89 - Sep. 21 '03)
Solar Terrestrial Relations Observatory (STEREO) [18 Sep. 2006]
Suomi National Polar-orbiting Partnership (Suomi NPP) [Oct. 28, 2011]
 - Earth at Night (Black Marble - City Lights 2012)
Space Flight Systems Directorate (Glenn Research Center)
Space Place (Science, technology and learning about space for elementary school kids)
Space Place (Ciencia, tecnología y aprendizaje sobre el espacio para escolares. En Castellano)
SpaceWeather.com (Science news and information about the Sun-Earth environment, Global satellite tracking)
Spitzer Space Telescope [Space Infrared Telescope Facility (SIRTF)] (con versión en Castellano)
Suzaku Learning Center (Formerly Astro-E2)
Terra Satellite (Lands, oceans, and atmosphere Earth Observation System - EOS)
The Exploration of the Earth's Magnetosphere (David P. Stern and Mauricio Peredo)
Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) (Mesosphere and Lower Thermosphere/Ionosphere, December 7, 2001)
The Gateway to Astronaut Photography of Earth (part of NASA's Space Shuttle Earth Observations Photography database)
The Great Magnet, the Earth, W. Gilbert (David P. Stern, English, Castellano, Française)
The New Mars - Mars 2004 (M2K4) (Multimedia)
THEMIS Mission Time History of Events and Macroscale Interactions during Substorms (Space Weather)
The Hubble Space Telescope
The Mars Orbiter Laser Altimeter (MOLA)
The Rossi X-ray Timing Explorer (RXTE) Learning Center
The Swift Gamma-Ray Burst Mission
Total Ozone Mapping Spectrometer (TOMS)
Tropical Rainfall Measuring Mission (TRMM)
Van Allen Probes (Earth's radiation belts, from August 30, 2012)
Viking Mission to Mars
Visible Earth
Wallops Flight Facility
WIND Spacecraft (Comprehensive Solar Wind Laboratory for Long-Term Solar Wind Measurements, from November 1, 1994)
Wide-Field Infrared Survey Explorer (WISE) (launched December '09)
Wilkinson Microwave Anisotropy Probe (WMAP) - Cosmology (Temperature differences in the cosmic microwave background radiation)
World Book @ NASA (Encyclopedia)

NASA - Jet Propulsion Laboratory (JPL):
Jet Propulsion Laboratory Home Page
Active Cavity Radiometer Irradiance Monitor (ACRIM) (Total Solar Irradiance measuring mission)
Airborne Synthetic Aperture Radar (AirSAR)
Amateur Astronomy
Asteroid Radar Research
Atmospheric Infrared Sounder (AIRS)
Cassini Solstice Mission (Saturn system)
Comet Shoemaker-Levy 9 Collision with Jupiter (July 1994)
Dawn Mission (Ion Propulsion. Asteroids Vesta and Ceres, from September 2007 to July 2015)
 - Dawn Clickworkers (NASA Ames's experiment in volunteer science: Identifying craters on Vesta and Ceres)
Deep Space Network (DSN) (Spacecraft Communications, Radio & Radar Astronomy)
Fundamental Physics in Space (Why Things Are The Way They Are)
Galileo Mission (Jupiter)
Genesis Mission (Solar Wind Sample Return)
JPL HORIZONS On-Line Solar System Data and Ephemeris Computation Service
 - Small-Body Database Browser (with Orbit Diagrams)
Keck Interferometer
Mars Exploration Program
 - 2001 Mars Odyssey
 - Mars Science Laboratory (Curiosity, the Next Mars Rover. Launched Nov. 26, 2011, Expected Arrival Aug. 2012)
 - Mars Odyssey Mission - Thermal Emission Imaging System (THEMIS)
 - Mars Exploration Rover Mission
Mars Meteorites Home Page
Mars Exploration Program: Technology
Mars Pathfinder
Mars Polar Lander Mission (all communication attempts ended on April 10 '00)
Near-Earth Asteroid Tracking (NEAT)
Near-Earth Object Program (NEO) (Don Yeomans, Ron Baalke)
NEO Earth Close-Approach Tables
New Millennium Program (NMP) (Advanced Technology in Space Flight)
Ocean Surface Topography from Space (TOPEX/Poseidon and Jason)
OnEarth (Landsat 7, WMS Global Mosaic of the Earth Web Map Service)
Palomar Testbed Interferometer (PTI)
Physical Oceanography Distributed Active Archive Center (PO.DAAC) (Ocean Surface Topography, Ocean Vector Winds, Sea Surface Temperature)
Planetary Data System (PDS)
Planetary Photojournal (NASA's Image Access Home Page)
PlanetQuest: Exoplanet Exploration
Planck Space Telescope (ESA & NASA) (launched 14 May 2009)
Programa de Exploración de Marte
Shuttle Radar Topography Mission (SRTM)
Solar System Dynamics (Information and Ephemeris for all known bodies in Solar orbit)
Solar System Simulator
Space Calendar (Space-related Activities, Ron Baalke)
Stardust Mission (Interstellar and Comet Wild 2 Dust Sample Return Mission. Feb 7, '99 - Jan 15 '06)
Ulysses Mission (Sun Orbiter)
Voyager Mission (Voyager 1 & 2: 1977-2020?)
Welcome to the Planets (PDS)
Winds Mission (Measuring Ocean Winds from Space)

National Oceanic and Atmospheric Administration (NOAA):
National Oceanic and Atmospheric Administration Home Page
Atlantic Oceanographic and Meteorological Laboratory (AOML) (with Hurricane FAQ)
Climate Prediction Center (CPC)
Coastal Services Center
Earth System Research Laboratory (ESRL)
 - Chemical Sciences Division (CSD)
 - Global Monitoring Division (GMD)
    - Solar Calculator (Google Earth)
 - Physical Sciences Division (PSD)
El Niño Theme Page (Distributed information on El Niño)
ESRL: PSD: Physical Sciences Division (Climate Variability)
Geophysical Fluid Dynamics Laboratory (GFDL)
Improved Sunrise/Sunset Calculator (Old version)
National Climatic Data Center (NCDC)
National Data Buoy Center
National Doppler Radar Sites
National Environmental Satellite, Data, and Information Service (NESDIS)
National Geophysical Data Center (NGDC)
National Hurricane Center - Tropical Prediction Center
National Oceanographic Data Center (Marine data and information)
National Operational Hydrologic Remote Sensing Center (Snow information)
Suomi National Polar-orbiting Partnership (NPP)
National Severe Storms Laboratory Norman, OK
National Weather Service (NWS) Home Page
National Weather Service (NWS) Internet Weather Source
National Weather Service (NWS) Space Weather Prediction Center
NOAA - Ocean Prediction Center - Unified Surface Analysis
NOAA - NWS Storm Prediction Center
NOAA - Tsunami Warning Center
NOAA Tides and Currents
NOAAWatch (NOAA's All-Hazard Monitor)
Operational Significant Event Imagery Server (OSEI)
Office of Satellite Data Processing and Distribution (OSDPD)
Solar Calculator (New version)
Solar Position Calculator (Old version)
Space Environment Center (SEC) (Solar Observations)
Tides and Currents (Center for Operational Oceanographic Products and Services)

European Space Agency (ESA):
European Space Agency Home Page
ESA - Space Science
 - Cassini/Huygens mission (Saturn, Titan, Enceladus)
 - Gaia (Map of the Milky Way, 19 December 2013)
 - Observing the Earth - Understanding Our Planet
 - Planck Space Telescope (ESA & NASA) (launched 14 May 2009)
 - Planck reveals an almost perfect Universe (Cosmic microwave background seen by Planck, 21 March 2013)
 - Rosetta Mission - Comet 67P/Churyumov-Gerasimenko Explorer (February 2004, May 2014)
 - SMART-1 Moon Mission (Ion Engine, September 27 2003 - September 6 2006)
 - Venus Express (9 November 2005, April 2006)
Giotto - Mission to Comet Halley (2 July 1985, 13 March 1986, 23 July 1992)
Herschel Space Observatory (May 2009 - 29 April 2013)
Hipparcos Space Astrometry Mission - Tycho Catalogues (8 August 1989 - March 1993)
Infrared Space Observatory (ISO) (November 1995 - April 1998)
Solar and Heliographic Observatory (SOHO) (ESA & NASA)

Students for the Exploration and Development of Space (SEDS):
SEDS Home Page
Bill Arnett's Web Sites (Site map for nineplanetes.org)
Herschel 400 list
Large Telescopes (Bill Arnett)
More Astronomy and Space Links (Hartmut Frommert, Christine Kronberg)
Orbiting Astronomical Observatories (Hartmut Frommert)
Planetarium Software (Bill Arnett)
Spider's Homepage (Hartmut Frommert)
The Discovery of the Deep Sky Objects (Hartmut Frommert, Christine Kronberg)
The Interactive NGC Catalog Online (Hartmut Frommert)
The Messier Catalog (Hartmut Frommert)
The Nine Planets (Bill Arnett)
The Nine Planets For Kids

Astronomical World-Wide Web Indexes (Índices Astronómicos en el World-Wide Web):

Astronomy in Latin America (LANIC) (University of Texas at Austin)
Astronomy Links (Astronomy and Space Related Links from Around the World)
Astro Web Astronomical Internet Resources, AstroWeb Consortium
Open Directory Project: Top: Science: Astronomy
Open Directory Project: World: Español: Ciencia y tecnología: Astronomía (en Castellano)
Scirus (For Scientific Information Only)

Astronomy Equipment (Equipo Astronómico):

Information (Información):
About Daylight Saving Time (DST) (Web Exhibits: History, rationale, laws & dates)
Astronomy Notes (Astronomy, Introductory college-level course by Nick Strobel, Bakersfield College)
Astrophotography Techniques (Catching the Light, by Jerry Lodriguss)
AutoStarSuite.Net (Your Source for Meade AutoStar, AutoStarSuite, LPI, and DSI information)
Calendars through the Ages (Web Exhibits: Calendars)
 - De revolutionibus orbium coelestium (Nicholas Copernicus, 1543)
 - Dialogue Concerning the Two Chief World Systems (Galileo Galilei, 1632)
CalSKY - The Calculated Sky On-line Configurable Astronomical and Space Calendar
Digital Imaging with Richard Berry
Digital Photography Review
Digital Processing Techniques (Catching the Light: Astrophotography by Jerry Lodriguss)
Geographic Names Server (GNS) (Geographic Names Data: Coordinates)
Google Earth (On-line Topographic Map of the Earth and Sky, Free Download)
Google Mars (On-line Elevation, Visible and Infrared Maps of Mars, Free)
Google Moon (On-line Elevation, Visible and Human Maps of the Moon, Free)
GSC Magnetic Declination Calculator
Heavens-Above (Sky and Satellite Visibility)
International Meteor Organization (IMO) (Calendarios de Lluvias de Meteoros)
Internet Encyclopedia of Philosophy (IEP) (Detailed information on key topics and philosophers)
Journal of Cosmology (Rudolf Schild, Executive Editor, Center for Astrophysics, Harvard-Smithsonian)
Khan Academy (A free world-class education for anyone anywhere)
Lewis Learning (Video and animation based curriculum resources)
Neave Planetarium (Browser Planetarium, Neave Interactive, Paul Neave)
Philosophiae Naturalis Principia Mathematica by Sir Isaac Newton (Free ebooks - Project Gutenberg)
Ocean World (Oceanography in the 21st Century, Texas A&M University)
Online Astronomy Text (Courtney Seligman, Professor of Astronomy, Long Beach City College, California)
Project CLEA (Contemporary Laboratory Experiences in Astronomy)
 - Ciencia@NASA (en Castellano)
Science and the Human Prospect (by Ronald C. Pine, Honolulu Community College)
SFA Star Charts (Mag. 5, PDF)
Sky & Telescope: How To - Astronomy Basics
Sky & Telescope: Observing Highlights
Sky & Telescope: Observing - Interactive Observing Tools
 - Sky & Telescope: Observing - Almanac v3.0
Sky & Telescope: Observing - Interactive Sky Chart
Skyhound (Greg Crinklaw, CapellaSoft)
SkyMaps.com (Free monthly sky maps and calendar)
SkyView (The Internet's Virtual Telescope)
StarDate Online - Your Guide to the Universe (McDonald Observatory, University of Texas)
The Astro Philes (Supplementary Resources for SJSU Astronomy Courses, Les Tomley, Sán José State University)
The Night Sky This Week (Information about the night sky and articles on astronomical topics. Emil Neata)
The Physics Factbook (an encyclopedia of scientific essays)
The Physics Hypertextbook (a work in progress)
The Resilient Earth (.pdf Downloadable Book. Doug L. Hoffman & Allen Simmons, 2008 - Free)
The Worlds of David Darling (Space & Science News)
 - The Internet Encyclopedia of Science
 - Encyclopedia of Renewable Energy and Sustainable Living
Timothy Ferris (Seeing in the Dark, The Whole Shebang, Coming of Age in the Milky Way)
Universo Online - Su Guía para el Universo (Observatorio McDonald de la Universidad de Texas, en Castellano)

Astrovid.com The Astronomer's Source for Imaging
Anacortes Telescope & Wild Bird Astronomy, Photo & Video, Sport Optics, Books, Wild Bird Supplies
Astromart Astronomy classifieds, articles, reviews and more
Astronomics Telescopes and Telescope Accessories
Astronomy-Mall Products and Services
Binoculars.com Binoculars, Telescopes, Spotting Scopes
Bonney Lake Astro Works Quality Telescope Accessories - Milburn Telescope Wedges
Celestron Telescopes, Microscopes, Binoculars and Accesories
Company Seven - Astro-Optics Division Telescopes and Accesories, Information
Coronado Instruments H-alpha filters for the Solar Observer
DayStar Filters (Ultra-narrow Bandpass filters)
Deep Space Products (Telescopes, Telescope Accessories, Custom Telescope Services)
Discovery Telescopes Dealers for Meade, Celestron, Tele Vue and Coronado
Edmund Scientifics Astroscan Telescope, etc.
Edmund Optics The World's Largest Inventory of Optical Components
Fishcamp Engineering Starfish Astro-camera/Auto-guider
Focus-Camera Digital and film cameras, telescopes, binoculars & electronics
Jim's Mobile, Inc. (JMI) Advanced Telescope Products
Kendrick Astro Instruments Dew heaters, solar telescopes, battery power packs, focusing aides
Losmandy Astronomical Products Precision Equatorial Mounts and Secondary Systems
MAG 1 Instruments PortaBall Telescopes
Magellan Corporation Consumer GPS Systems
Meade Instruments Corporation Telescopes, Microscopes, Meade Instruments
 - Meade Advanced Products Users Group (MAPUG)
Murnaghan Instruments Precision imaging systems, equipment and accessories
Oceanside Photo & Telescope (OPT) Astronomy Telescopes, Accessories, CCD and Digital Cameras
Omega AstroFilters (Amateur Astronomy Filters from the Supplier of the Hubble Space Telescope)
Orion Telescopes & Binoculars Telescopes, Binoculars and Accesories
PreciseParts Custom Parts for Astronomy. Your Online Astro Machine Shop
Rigel Systems QuikFinder Compact Reflex Sight and other accessories
Santa Barbara Instrument Group (SBIG) The Pioneering CCD Company
ScopeTronix The largest telescope dealer in the southeast
Scopestuff Telescope Accesories and Hardware
Supercircuits Inc. Americas CCTV, video security, cameras, security cameras and surviellance equipment
Surveillance Video Home Security Cameras, Surveillance Cameras, Security Camera Systems
Teleport Telescopes The Telescoping Telescope
Telescopes.com Telescopes, binoculars and accesories
Tele Vue Optics Inc. Telescopes, eyepieces, accesories
Thousand Oaks Optical Solar, nebular and H-Alpha filters, solar eclipse viewers, dew heaters
Vixen Telescopes and mounts, Binoculars, Field Scopes, Microscopes, Compasses
William Optics USA Telescopes, Diagonals, Prisms, Eyepieces, Digital Camera Adapter Lenses, Accesories, Binoculars

Aberrator (Star-Test Image Simulator, Freeware, MS Windows)
Adobe Acrobat Reader (Freeware PDF format reader)
alcyone astronomical software (Free Planetary, Lunar, and Stellar Visibility calculator)
ASCOM - Standards for Astronomy (Free ASCOM Platform and Drivers)
Astroart Astronomical Images Processing and Analysis, by Fabio Cavicchio and Martino Nicolini. (MS Windows)
AstroPlanner Astronomical Planning & Logging Software (MS Windows and Macintosh, with Free version)
BlackFrame NR Noise reduction using Black frame method, Mediachance Freeware (MS Windows)
Computer Aided Astronomy (C2A) Planetarium software, Freeware (MS Windows)
CapellaSoft (Sky Tools 2, PC-Sky, MS Windows, CD-ROM)
Cartes du Ciel - Sky Charts Free Astronomy software, Planetarium & Celestial atlas (MS Windows, Patrick Chevalley, English version, versión en Castellano)
Celestia (Free real-time space simulation for Windows, Linux, and Mac OS X)
Celestrak NORAD Two-Line Satellite Elements Sets. Freeware by Dr. TS Kelso.
Cielo e Terra "Sky Draw - Mappa del Cielo", "Earth Map - Mappa della Terra", "Eclipses & Earth - Eclisse e Terra", "Planetarium - Planetario", by Piero Massimino, CAO. (On-line Freeware, and MS Windows)
CyberSky Planetarium program (MS Windows)
DeepSky Astronomy Software, by Steve Tuma. (MS Windows CD)
DeepSkyStacker Registering, Stacking. Freeware (MS Windows)
Distant Suns Planetarium program, by Mike Smithwick, 4.4MB .zip download of v4 Demo. (MS Windows, CD-ROM, Adobe Acrobat, DirectX)
Deep Space Planetarium program, David Chandler Company. (MS DOS)
GIMP The GNU Image Manipulation Program. Freeware (GNU/Linux, Mac OS X, Windows)
Hallo northern sky (HNSKY) Planetarium program with 10,607 deepsky objects and all stars to magnitude 12, and with the original GSC CD-ROM's, GSC-ACT or the USNO to magnitude 15 or more. Displays all planets, the Moon, Sun, moons of Saturn and Jupiter, Mars, Uranus and Neptune and a few hunderd asteroids and comets. By Han Kleijn. Freeware (MS Windows)
Home Planet Comprehensive Astronomy Software Package. Freeware (John Walker, MS Windows)
Intricate Micro Systems (Win245, CB245 Cookbook Camera Image Acquisition software)
Mars Previewer II Calcula las efemérides físicas de Marte y muestra una imagen realista del planeta. Calculates Mars physical ephemeris and draws a realistic image of the planet. Freeware by Leandro Ríos. (3 MB, MS Windows)
MAXCLOCK Free High-precision digital astronomical software clock. Udo Mark (MS DOS/Windows).
MyStars! (Relativedata Inc, MS Windows on-line planetarium software)
Occult Free Occultation Calculations software (Dave Herald, IOTA, MS Windows)
PhET (Free online physics, chemistry, biology, earth science and math simulations)
Planetarium Software (Bill Arnett)
Previsions for the ISS, the HST for the next 10 days Satellites Observation, by Alphonse Pouplier. (On-line Freeware, and MS DOS)
Project Pluto 'Guide' planetarium program (MS DOS & Windows, CD-ROM)
Radio-Sky Sidereal Clock (Freeware, MS Windows)
RegiStar (Automatic image registration for astrophotography, MS Windows)
Registax (Automatic image registration for astrophotography, Freeware, MS Windows)
Satellite tracking with GPS Varol Ocan (MS Windows)
SkyMap Star charting software for astronomers (MS Windows)
SkyView (The Internet's Virtual Telescope, NASA)
Software Bisque TheSky planetarium program (MS Windows, CD-ROM)
StarCalc Astronomy planetarium & star mapping program by Alexander Zavalishin. Freeware (MS Windows)
Starry Night Planetarium program, Sienna Software (MS Windows or Macintosh)
Stellarium (Free open source planetarium for your computer, by Fabien Chereau et al.)
 - ASCOM Initiative (Free Interface Standards and astronomical instrument drivers)
 - StellariumScope (Free Telescope Control, Welsh Dragon Computing)
Sundials Shadows - Design sundials and astrolabes (Française/English) François Blateyron. Freeware (MS Windows)
SunGraph Graphical Sun Ephemerides - Bob Urschel. Freeware (MS Windows and Macintosh)
The Earth Centered Universe (ECU) (Nova Astronomics, MS Windows)
UnitJuggler unit converter Free (Pierre Di Marco, Online Application)
Virtual Moon Atlas Free Astronomy software, Moon observation or survey (MS Windows, Patrick Chevalley, Christian Legrand, English version, versión en Castellano)
WinStars Shareware planetarium software (MS Windows, Franck Richard)
World Wind (NASA - Free Topographic Satellite Map of the Earth, Moon, Venus, Mars, Jupiter and the sky)
WXTide32 (Free Windows tide and current prediction program)

Other Astronomy and Astrobiology Web Sites (Otros sitios de Astronomía y Astrobiología en el Web):

25 Years of Voyager: An Epic Jouney (University of California)
3-D Star Maps (Winchell Chung)

Abrams Planetarium (Night Sky Notes)
Active Cavity Radiometer Irradiance Monitor (ACRIM) Total Solar Irradiance (TSI) Monitoring
Adler Planetarium and Astronomy Museum
Advanced Composition Explorer (ACE) (Sampling of low-energy particles of Solar origin and high-energy Galactic particles)
Aeronomy of Ice in the Mesosphere (AIM) (Satellite Exploration of Polar Mesospheric Clouds - Noctilucent Clouds)
Alan Kostelecky (Standard-Model Extension (SME) - Background information on Lorentz/CPT Violation)
Albert Einstein - Image and Impact (American Institute of Physics History Center exhibit)
Albert Einstein Online (S. Morgan Friedman)
Almanako Almanac of Astronomical Events (Rick Wiegmann Koshko, English/Esperanto)
American Association of Amateur Astronomers (AAAA)
American Association of Variable Star Observers (AAVSO)
American Astronomical Society (AAS)
Amateur Astronomers Association of New York City (AAA)
American Institute of Mathematics (AIM)
American Institute of Physics (AIP)
American Mathematical Society (AMS)
American Physical Society (APS)
American Satellites Orbital Data at AMSAT
Analemma (Bob Urschel)
Apache Point Observatory
 - APOLLO (Lunar Laser-ranging Operation)
Apollo Image Archive (Arizona State University)
Archaeoastronomy (Spotlights the dawn of human history)
Archives of Electronic Publishing in Science (arXiv) (Cornell University Library, Los Alamos National Laboratory)
Arecibo Observatory (National Astronomy and Ionosphere Center, NSF, Cornell University)
Arkansas Sky Observatory (Fournier Lunar Atlas)
Artemis Project (Privately financed commercial venture for a permanent, manned Lunar base)
Association of Universities for Research in Astronomy Inc (AURA)
Association of Lunar and Planetary Observers (ALPO) (Harry Jamieson)
Asteroid Occultation Predictions (Steve Preston)
Astrium GeoInformation Services: Satellite maps & images - geospatial solutions (SPOT Satellites)
Astrobiology Magazine
Astronomers Without Borders (one People, One Sky)
 - The World At Night (TWAN) (Sky and Landscape Photographs)
Astronomical League
Astronomical Society of the Pacific
Astronomy & Astrophysics (An International Weekly Journal)
Astronomy - at UCLA (Ned Wright, Vice Chair for Astronomy, WISE Principal Investigator, UCLA)
Astronomy Boy (Resources & Tutorials for Amateur Astronomers)
Astronomy Cafe (Ask the Astronomer, Dr. Sten Odenwald)
Astronomy.com (Astronomy Magazine)
Astronomy in Latin America (LANIC) (University of Texas at Austin)
Astronomy Links (Astronomy and Space Related Links from Around the World)
Astronomy Notes (Astronomy, Introductory college-level course by Nick Strobel, Bakersfield College)
Astronomy Now
Astronomy to Go (Bob Summerfield, The Yard Scope)
Astrophotographer.com (Wil Milan)
Astrophotography by Tom Matheson
Astrophotography with small telescopes (Stefan Beck)
Astrophysical Journal
Astro Web (Astronomy on the Internet - Astronomically Relevant Internet Resources)
A Universe in Time (Images and Resources in Astronomy)
Aurora's Northern Lights (Jan Curtis)
A Walk Through Time National Institute of Standards and Technology (NIST)

B612 Foundation (To significantly alter the orbit of an asteroid, in a controlled manner, by 2015)
Bartol Neutron Monitors (Cosmic ray monitors. University of Delaware, Bartol Research Institute)
Berkeley Cosmology Group
Berkeley Open Infrastructure for Network Computing (BOINC) (SETI@home, Einstein@Home, etc.)
Big Bear Solar Observatory (BBSO) (New Jersey Institute of Technology)
Bing Maps (Microsoft Virtual Earth)
Blind Watchmaker Applet (Mark Jones, conceived by Richard Dawkins)
Botany online - The Internet Hypertextbook
BOOMERANG (Balloon Observations Of Millimetric Extragalactic Radiation ANd Geophysics)

California Institute of Technology Infrared Processing & Analysis Center (IPAC)
Cassini Imaging (CICLOPS) (Saturn, its rings & moons)
Catching the Light (Astrophotography, Jerry Lodriguss)
Center for Archaeoastronomy
Center for Backyard Astrophysics (CBA) (Photometry of Cataclysmic Variables, Astronomy - Columbia University)
Center for Environmental Biotechnology (CEB) (Biosensors, University of Tennessee)
Center for Particle Astrophysics (CfPA)
Center For Southeastern Tropical Advanced Remote Sensing (CSTARS) Rosenstiel School of Marine and Atmospheric Science (RSMAS), Virginia Key, Florida
Central America Monitoring and Visualization System (SIAM-SERVIR)
Ceres: The Dwarf Planet
Chabot Space & Science Center (East Bay Area - Oakland CA)
Chandra X-Ray Observatory Center
Charles Darwin Foundation for the Galapagos (con una sección en Castellano)
Chemical Elements.com - An Interactive Periodic Table of the Elements (Yinon Bentor)
Classical Astronomy (Jay Ryan)
ClearDarkSky (Clear Sky Charts for Canada, USA and parts of Mexico - Attilla Danko)
 - Clear Sky Alarm Clock (Mark Casazza)
Clementine - Mission Overview
Clementine - Deep Space Program Science Experiment (Naval Research Laboratory - NRL - Lunar Image Browser)
ClimatePrediction.Net (BOINC distributed computing project to produce predictions of the Earth's climate)
Climate Realists (Real explanations as to what has made our climate change)
Cloudbait Observatory (Colorado Rocky Mountains)
Clyde Tombaugh (1906-1997) (by Jeff Foust)
Cometography (Gary Kronk)
Computing Sun & Moon Transits by the International Space Station (Tom Fly)
Cool Cosmos! (IPAC - California Institute of Technology)
Cooperative Institute for Research in Environmental Sciences (CIRES) (University of Colorado at Boulder)
Cooperative Institute for Meteorological Satellite Studies (CIMSS) (University of Wisconsin - Madison)
 - Tropical Cyclones A Satellite Perspective
COsmic Background Explorer (COBE) Mission (at Lawrence Berkeley Laboratory)
Cosmic Microwave Background Radiation (Douglas Scott)
Cosmic Microwave Background Radiation, an Introduction (Wayne Hu)
Cosmic Microwave Background Astrophysics Research Program (UC Berkeley - Lawrence Berkeley National Laboratory, George Smoot)
Cosmology Tutorial (Ned Wright, Vice Chair for Astronomy, UCLA)
Cosmos in a Computer (One of the best cosmology sites in the Web,
part of NCSA's Multimedia Online Expo, Science for the Millennium,
a "pavilion" of the Internet 1996 World Exposition)

Dale Ireland's Astronomy Page (Dale Ireland)
Dark Skies Awareness
Dave Jurasevich's Images of the Universe (Dave Jurasevich)
Dave Palmer's Astronomy Page (Dave Palmer)
Deep Impact (Mission to impact Comet Tempel 1 in July 4 '05, and fly past Comet Hartley 2 in 2010)
Digital Sky LLD (Milky Way Panoramics)
Distributed Information Services for Climate and Ocean Products and Visualizations for Earth Research (DISCOVER)
 - Daily Earth Temperatures from Satellites (AMSU-A Temperatures, University of Alabama in Huntstville - UAH)
Dive and Discover - Expeditions to the Seafloor
Dr. James R. Webb (FIU Department of Physics)
Dynamical Astronomy JavaLab (Case Western Reserve University)

Earthquake Track (Map of Earthquakes Today)
EarthSky.org (Radio Series - A Clear Voice for Science)
Earth Science, Logistics, and Outreach Terrainbases (EarthSLOT)
Eclipse Chaser (Jeffrey R. Charles)
Eclipser (Weather and Map Files, Jay Anderson)
Edge Foundation Promoting inquiry into and discussion of intellectual, philosophical, artistic, and literary issues
 - The Third Culture (Beyond the Scientific Revolution, by John Brockman)
Einstein@Home [BOINC project for MS Windows, Macintosh & UNIX]
A scientific experiment that will harness the power of Internet-connected computers to search for spinning neutron stars (called pulsars) using data from the LIGO and GEO gravitational wave detectors.
Einstein Online (English version, Max Planck Institute)
Elsevier (Science and health information)
Encyclopedia.com (A collection of online encyclopedias)
Encyclopedia Astronautica (History of Spaceflight)
Encyclopedia of Life (Encyclopedia of Life - Animals - Plants - Pictures & Information)
Entropy and the Second Law of Thermodynamics (Frank L. Lambert, Occidental College, Los Angeles)
Environmental Molecular Sciences Laboratory - William R. Wiley (EMSL) (Artificial/Computational Intelligence)
Epoxi Mission (Flyby of Comet Hartley 2 in November 4, 2010, University of Maryland)
eSky: The Electronic Sky
 - Planet Wheel (a guide to the visibility of the planets in the sky)
European Centre for Medium-Range Weather Forecasts (ECMWF) (Deterministic medium-range forecast charts)
European Southern Observatory (ESO) La Silla, Paranal - Chile
 - New Technology Telescope (NTT)
 - Very Large Telescope (VLT)
 - European Extremely Large Telescope (E-ELT) (project)
Exploratorium (San Francisco)

Far Ultraviolet Spectroscopic Explorer (FUSE) (Johns Hopkins University - NASA: June 24, 1999 - July 12, 2007)
Fermi National Accelerator Laboratory (Fermilab)
Focus Fusion Society (Practical, Safe, Low-Cost Clean Energy, from Hydrogen & Boron by Nuclear Fusion)

Galaxy Evolution Explorer (GALEX)
Gemini Observatory (Mauna Kea, Hawaii & Cerro Pachón, Chile)
GEO600 (Direct Detection of Gravitational Waves)
Guide To Astronomy
Gravity Probe B (Testing Einstein's Universe)
Gravity Recovery And Climate Experiment (GRACE)
Grazing Occultation Events (United States/S. Canada/N. Mexico - Interactive Maps of Event Paths, Brad Timerson)
Boonhill Amateur Astronomy (Greater Michigan astronomical community, Douglas Bock)
Great Circle Calculator (Javascript, Ed Williams)
Griffith Observatory

Haughton-Mars Project (HMP) (Mars on Earth 2006, a study of an Artic analog for Mars)
Hawaiian Astronomical Society
High Altitude Observatory (HAO) (Solar and Atmospheric Physics Research and Education)
High-Energy Transient Explorer 2 (HETE-2) (MIT)
High Resolution Imaging Science Experiment (HiRISE) (Exploring Mars in images, The University of Arizona)
 - HiRISE en español (Descubriendo Marte en imágenes)
Hobby-Eberly Telescope (HET)
Hubble Space Telescope Key Project on the Extragalactic Distance Scale (California Institute of Technology)
How Stuff Works (Marshall Brain)
HyperPhysics Concepts (Rod Nave, Georgia State University)

ICSTARS Astronomy (Southern Skies Star Party [SSSP] - Titicaca, Bolivia)
Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) [at Southwest Research Institute (SwRI)]
Inconstant Moon (Multimedia tours of the lunar surface)
Institute for Marine Remote Sensing (IMaRS) (University of South Florida)
International Astronomical Union (IAU)
 - Central Bureau for Astronomical Telegrams (CBAT)
 - Minor Planet Center (MPC)
 - Recent Comet magnitudes (ICQ/CBAT/MPC)
 - International Comet Quarterly (ICQ)
 - Astronomical Headlines
 - Minor Planet & Comet Ephemeris Service
 - Orbital Elements for Software Packages
 - Observable Comets
International Year of Astronomy 2009 (IAU IYA2009) The Universe: Yours to Discover
 - Galilean Nights What Galileo observed in the sky; The Moon, Jupiter and more (22-24 October '09)
International Dark-Sky Association (IDA)
International Occultation Timing Association (IOTA)
International Society for Archaeoastronomy and Astronomy in Culture (ISAAC)
Internet Amateur Astronomers Catalog (IAAC) (NetAstroCatalog Mailing List, Lew Gramer)
Introduction to Earth Sciences I (John C. Mutter)
Introduction to Physical Geography (Christine M. Rodrigue Ph.D., California State University, Long Beach)
Institute of Physics
IOTA Asteroidal Occultation, Mid-Atlantic Occultation, Eclipse, and Lunar Impactors Page
ITER (Large-scale international scientific experiment to produce commercial energy from tokamak atomic fusion)

Java based Mars geographical information system - JMARS (Arizona State University)
John Baez's Stuff (Quantum Gravity & n-Categories)
JunkScience.com (All the junk that's fit to debunk. Steven Milloy, Publisher)

Kid's Cosmos (Science Resources for Teachers and Students)

Laser Interferometer Gravitational Wave Observatory (LIGO) (California Institute of Technology)
Lawrence Berkeley National Laboratory
Lick Observatory (University of California Observatories)
Life32 Conway's Game of Life (Cellular Automata) freeware for MS Windows (Johan Bontes)
Lights in the Dark Photos & News About Our Solar System, by J. Major
Lincoln Near Earth Asteroid Research (LINEAR) (MIT Lincoln Laboratory)
Linda Hall Library of Science, Engineering and Technology - Online Exhibitions
Living Reviews in Relativity (Research Journal, Max Planck Institute)
Lockheed Martin Solar and Astrophysics Laboratory (LMSAL)
Lost Valley Observatory and Astrophotography (Keith Quattrocchi)
Lowell Observatory (Orbital Elements for Asteroids)
 - Asteroid Data Services
Lunar and Planetary Institute Universities Space Research Association (USRA)
 - Digital Lunar Orbiter Photographic Atlas of the Moon
Lunar and Planetary Laboratory (LPL) (University of Arizona, Tucson)
Lunar Occultations and Grazes (IOTA)
Lunar Picture of the Day (LPOD)
Lunar Reconnaissance Orbiter Camera (LROC)
Lunar Research Institute (Dr. Alan Binder)

Malin Space Science Systems (MSSS)
 - MSSS Marslink Essays
Map Collection (Perry-Castañeda Library, University of Texas, Austin)
Marquette Astronomical Society
Mars Atmosphere and Volatile Evolution Mission (MAVEN) (Nov. 18, 2013)
Mars Odyssey Mission - Thermal Emission Imaging System (THEMIS)
Mauna Loa Solar Observatory (HAO/NCAR)
McDonald Observatory (University of Texas)
MCell 1D and 2D Cellular Automata (Game of Life) explorer freeware for MS Windows (Mirek Wojtowicz)
Mel Bartels' BB AstroDesigns (Computer Operated Telescopes and Telescope Making)
 - Collimating a F3 Telescope
MESSENGER Mission (Mercury Surface, Space Environment, Geochemistry and Ranging. Johns Hopkins University)
Messier45.com (Deep Sky Browser, Messier Gallery, Herschel 400)
MetEd (Meteorology Education & Trainning)
Meteor Showers Online (Gary Kronk)
Metric Conversions (Metric conversion calculators and charts)
Michelson Doppler Imager project (MDI) (Stanford-Lockheed Solar Oscillations Investigation (SOI) - SOHO)
Mike Brown (Planetary Astronomy, Caltech)
Milkyweb Astronomical Observatory Guide (Wolfgang Grond)
Molecular Expressions (Images from the Microscope. Secret Worlds: The Universe Within - Powers of 10. Java)
Moonglow Observatory (Fred Bruenjes' Astronomy Stuff)
Mount Graham International Observatory (MGIO) (University of Arizona)
Mount Wilson Observatory
MrEclipse.com The Ultimate Resource For Eclipse Photography (Fred Espenak)
Multiwavelength Astronomy Gallery (Cool Cosmos)

NGA: GEOnet Names Server (GNS) (Geographic Names Data: Coordinates)
National Center for Atmospheric Research (NCAR)
National Geographic Society Magazine Online (con versión en Castellano)
National Radio Astronomy Observatory (NRAO)
  Atacama Large Millimeter Array (ALMA)
  Robert C. Byrd Green Bank Telescope (GBT)
  Very Large Array (VLA)
  Very Long Baseline Array (VLBA)
National Science Foundation (NSF)
National Solar Observatory (NSO)
National Space Science and Technology Center - UAH (NSSTC)
National Space Society (NSS)
National Optical Astronomy Observatories (NOAO) Cerro Tololo Inter-American Observatory (CTIO) and Kitt Peak National Observatory (KPNO)
Naval Research Laboratory - Large Angle and Spectrometric Coronagraph Experiment (LASCO)
Naval Research Laboratory - Monterey: Marine Meteorology Division (NRL-MRY)
Naval Research Laboratory - Monterey: Satellite Meteorology (NRL-MRY)
NEAR - Shoemaker (Near-Earth Asteroid Rendevouz with Eros)
Neil Hammerschlag (Rosenstiel School of Marine and Atmospheric Science, University of Miami)
New England Meteoritical Services (Meteorites)
Nobelprize.org (Nobel Prizes, Nobel Foundation)
Nongovernmental International Panel on Climate Change (Climate Change Reconsidered)
NOVA (PBS Science Online Programming)
 - Einstein's Big Idea (Relativity)
 - Galileo's Battle for the Heavens (The birth of science)
 - Origins: Series Overview (The Beginning of Everything)
 - The Elegant Universe (String Theory)
 - To the Moon (The science and engineering story)
 - Tracking El Niño
Northeast Florida Astronomical Society (NEFAS) (Roger Curry)
Northern Virginia Astronomy Club (NOVAC)
Novaspace Galleries
NuSTAR (Nuclear Spectroscopic Telescope Array, High energy X-ray orbiting telescope, Aug '11)

OnEarth Magazine (Environmental Issues, NRDC)
On-Line Biology Book (Michael J. Farabee)
On the Origin of Species by Means of Natural Selection - Charles Darwin (Online Library of Literature)
Orbitron (Free Satellite tracking software)

PALEOMAP Project (The history of Earth and Climate, Christopher R. Scotese)
Paul Goelz's Web Site (Astronomy, Videoastronomy, modification to the Supercircuits PC23C video camera)
Peoria Astronomical Society
Phoenix Mars Mission (NASA-LPL, Underground water, 4 August 2007 - 25 May 2008)
PhysicalGeography (Dr. Michael Pidwirny, University of British Columbia Okanagan)
Physics Central
physicsworld.com (Physics World Magazine)
Phys.Org (Science, research and technology news service)
 - Astronomy News
Planetary Rings Node (of the JPL Planetary Data System)
Poor Meadow Dyke Observatory (PMDO) Telescope and CCD Webcam Modifications for Astrophotography
Proceedings of the National Academy of Sciences of the United States of America
Project Gutenberg (Fine Literature Digitally Re-Published, Your FREE Personal Library, Free ebooks)
Projects in Scientific Computing (Pittsburgh Supercomputing Center)
ProSpace; The Citizens' Space Lobby
Puckett Observatory (Automated Supernova Search, Tim Puckett)

Real Time Satellite Tracking
Relativity Tutorial (Ned Wright, Vice Chair for Astronomy, UCLA)
Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) (U. of Berkeley)
Revista Latino-Americana de Educación en Astronomía (RELEA) (en Portugués, Castellano e Inglés)
Revista Universo Digital - Liga Iberoamericana de Astronomía (LIADA) (en Castellano)
RichardDawkins.net (Richard Dawkins Foundation and Website)
Robert Reeves - Schmidt Camera Astrophotography
Robinson Lunar Observatory
Robotic Optical Transient Search Experiment (ROTSE)
Rossi X-ray Timing Explorer (RXTE) (MIT)

Saguaro Astronomy Club
San Jose Astronomical Association
SandlotScience.com (Science and Optical Illusions)
SciDev Magazine Online A free access gateway to information about science and technology for developing countries
Science Magazine Online (American Association for the Advancement of Science - AAAS)
Science Timeline
Science U (Learn About Science)
Scientific American (Science News, Articles and Information)
Seeing Our World in a Different Light (Cool Cosmos - Infrared Light Lessons)
SETI@home BOINC project. For MS Windows, Macintosh & UNIX)
  A scientific experiment that harnesses the power of hundreds of thousands of Internet-connected computers in the Search for Extra-Terrestrial Intelligence. You can participate by running a screensaver program that downloads and analyzes radio telescope data. There's a small but captivating possibility that your computer will detect the faint murmur of a civilization beyond Earth. (Windows: 710KB Screen-Saver download, 350KB each Data Unit. 32MB RAM, 8-bit color in 800x600 resolution display requeried)
  Un experimento científico que utiliza el poder de cientos de miles de computadoras con conexión al Internet para la Búsqueda de Inteligencia Extra-Terrestre. Ud. puede participar corriendo un "Screen-Saver" que baja y analiza datos de radio-telescopios. Hay una pequeña, pero cautivadora posibilidad de que su computador detectara el leve murmullo de una civilización extra-terrestre. (Windows: 710KB Screen-Saver download, 350KB cada Unidad de Datos. 32MB RAM, color de 8 bits en un display con resolución de 800x600 requeridos)
SETI Institute
SETI League
Sharkwater (Rob Stewart, exploring sharks)
Shark Research Institute (Shark conservation, education, research)
Sierra Remote Observatories (Robotic imaging and data acquisition. California, Sierra Nevada Mountains)
Sky & Telescope
Skyhound (Sky News & Event Calendar for observers, by Greg Crinklaw)
Sloan Digital Sky Survey
Smithsonian Institution
 - Global Volcanism Program (National Museum of Natural History - Smithsonian Institution)
 - Smithsonian National Air & Space Museum
Society for Amateur Scientists
Solar Radiation and Climate Experiment (SORCE)
Solar Terrestrial Activity Report (Jan Alvestad)
Sondas Espaciales (en Castellano)
Southeastern Association for Research in Astronomy (SARA)
South Florida Amateur Astronomers Association (SFAAA) (The Fox Observatory)
South Pole Telescope (SPT) (Dark Energy, Cosmic Microwave Background. University of Chicago)
Southern Cross Astronomical Society (SCAS) (Winter Star Party, West Summerland Key, Florida)
Space.edu (University of North Dakota - Department of Space Studies)
Space.com (Space news, with free e-mail updates)
Space Archive (Ventura County, California. Brian Webb)
Spaceflight Now (Online Space News)
Space Exploration Technologies Corporation - SpaceX (Commercial Orbital Transportation Services, Dragon Spacecraft)
Space Explorers, Inc. (Bringing Space Into the Classroom)
Space Frontier Foundation
Space News
SpaceRef.com (Space Exploration News)
Space Time Travel (Relativity Visualized)
Spacetime Wrinkles (One of the best Relativity sites in the Web,
part of NCSA's Multimedia Online Expo, Science for the Millennium,
a "pavilion" of the Internet 1996 World Exposition)
Staigerland Solar Eclipse Webcasts (Philip Staiger)
Stanford Linear Accelerator Center (SLAC) (Stanford University, U.S. Dept. of Energy)
Stanford SOLAR Center (Stanford University)
StarDate Online - Your Guide to the Universe (McDonald Observatory, University of Texas)
StarGarden Foundation to promote public interest and knowledge of astronomy (Victor & Jennifer Winter)
Star Gazer (Jack Horkheimer, 1938-2010) One year of weekly naked-eye astronomy shows
Stephen Wolfram Scientist, Creator of Mathematica, and Author of A New Kind of Science (NKS Online)
 - Wolfram|Alpha (Computational Knowledge Engine, launched May 18, 2009)
 - Wolfram Research (Mathematica: a numeric and symbolic computational engine, graphics system,
     programming language, documentation system, and advanced connectivity to other applications)
 - Wolfram Science (The Official Website of Stephen Wolfram's A New Kind of Science)
 - Eric Weisstein's Science World (Worlds of Astronomy, Biography, Chemistry, Mathematics, Physics)
 - Wolfram Educational Portal (Resources for pre-college grade levels)
 - Wolfram Web Resources (Other Wolfram Sites, including The Integrator - powered by Mathematica,
   Demonstrations - Interactive visualizations in math and science - powered by Wolfram Mathematica Player)
Stratospheric Observatory for Infrared Astronomy (SOFIA) (NASA & DLR)
Submillimeter Wave Astronomy Satellite (SWAS)
Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) (U.S. Naval Research Laboratory - NRL)
Sungazer.net (Observing the Sun in Hydrogen-Alpha and Calcium Light)
Sungrazing Comets (SOHO Comets) (U.S. Naval Research Laboratory - NRL)

Tanner's General Chemistry (Tanner McCarron)
TerraServer-USA (Maps and aerial photographs of the United States)
The Astrolabe (The Electric Astrolabe)
The ATM Site (Resources and Techniques for Amateur Telescope Makers)
The Ayn Rand Institute (Promoting reason, rational self-interest, individual rights and laissez-faire capitalism)
 - Ayn Rand's Ideas (A Philosophy for Living on Earth)
The Constellations and their Stars (Chris Dolan)
The Constellations Web Page (Richard Dibon-Smith)
The Electronic Universe (University of Oregon, Department of Physics)
The First Men on the Moon: The Apollo 11 Lunar Landing (Experience the Lunar Landing - An online interactive)
The Hayden Planetarium
The Hayden Planetarium
The Mythology of the Constellations (Cathy Bell)
The New York Times: Science
The Night Sky Live - Continuos Camera (CONCAM)
The Official String Theory Web Site (Patricia Schwarz)
The Particle Adventure (en 8 idiomas, incluyendo La Aventura de las Partículas, en Castellano)
The Planetary Society
 - Asteroids and Comets
The Second Law of Thermodynamics (Frank L. Lambert, Professor Emeritus, Occidental College, Los Angeles)
The Shallow Sky (Observing the Solar System, by Akkana)
The Talk.Origins Archive (Exploring the Creation/Evolution Controversy)
The Telescope Review Web Site (Ed Ting)
The Telson Spur (The Snark Hunter's Page, Links in The Study of Time and Evolution)
The Tree of Life Web Project (Information about phylogeny and biodiversity)
The University of California Planet Search Project
The University of North Dakota - Sun-Earth-Moon System (SEMS) Project & Webcasts
The Van Allen Probes (Johns Hopkins University, Applied Physics Laboratory)
The WWW Virtual Library (The oldest Web catalog, started by Tim Berners-Lee, creator of HTML and the Web)
time and date.com
Timeline Index (Chronologies of People, Periods, Places, Events)
Transition Region and Coronal Explorer (TRACE)
Tropical Rain Forest Information Center (TRFIC)
Two-Micron All-Sky Survey (2MASS) (University of Massachusetts, Amherst)
Two-Micron All-Sky Survey (2MASS) at IRSA

UCLA - Division of Astronomy & Astrophysics
U.C. Santa Barbara Astrophysics Project
Union of Concerned Scientists (Citizens and Scientists for Environmental Solutions)
United Space Alliance (Space Shuttle main contractor, with live mission tracking & telemetry data, NASA-TV links)
Unisys Weather
Universe Today (Space News from around the Internet, updated every weekday)
University of Alabama - Department of Physics and Astronomy (Astronomical Images)
University of Arizona - Department of Astronomy and the Steward Observatory
University of California Museum of Paleontology (UCMP) (Phylogeny, Geology & Evolution Exhibts)
University of California Observatories (Lick Observatory)
University of Miami Astronomy Club (Nicholas Copernicus Observatory)
Universo Online - Su Guía para el Universo (Observatorio McDonald de la Universidad de Texas, en Castellano)
Usenet Physics and Relativity FAQ (General, Particle and Nuclear, and Quantum Physics, Relativity and Cosmology)
U.S. Geological Survey Home Page (USGS)
 - Astrogeology: Gazetteer of Planetary Nomenclature (USGS-IAU-NASA)
 - Astrogeology: Map-a-Planet (PDS) (Mercury, Venus, Moon, Mars, Moons of Jupiter, Moons of Saturn)
 - Earth Explorer
 - Earthquake Hazards Program
 - La Ciencia del Agua para Escuelas
 - Landsat Project
 - National Geomagnetism Program
 - Water Science for Schools
U.S. Global Change Research Information Office
U.S. National Virtual Observatory (NVO)
U.S. Naval Observatory (USNO)
U.S. Naval Observatory - Astronomical Applications Department (Data Services)
U.S. Naval Observatory - Time Service Department
USNO Flagstaff Station Integrated Image and Catalogue Archive Service

Vatican Observatory
Ventanas al Universo (University of Michigan)
Video Capture Astrophotography (Jim Ferreira)
Views of The Solar System (Calvin J. Hamilton) English
 - Vistas del Sistema Solar (Calvin J. Hamilton) Castellano
 - Vistas do Sistema Solar (Calvin J. Hamilton) Português
 - Regards sur le Système Solaire (Calvin J. Hamilton) Fraçais
 - Ansichten des Sonnensystems (Calvin J. Hamilton) German
Violence in the Cosmos (Explosive Processes and the Evolution of the Universe, Michael W. Guidry)
Visual Quantum Mechanics Tutorials (Kansas State University - Physics Education Group)
Visual Satellite Observer's Home Page (SATOBS)
 - MIR Space Station - 15 Years In Orbit (Feb 19, 1986-2001)
Voyager Plasma Wave Investigation (Voyager 1 & 2: 1977-2020? The University of Iowa)

Warren Astronomical Society
Weasner's Mighty ETX Site
Weasner's LXD55 Site
Weatherbase (World monthly weather records and averages)
Weather Underground
Web Elements.com (An Interactive Periodic Table of the Elements)
We Choose the Moon (The Apollo 11 adventure - John F. Kennedy Presidential Library & Museum)
Wendy Carlos Eclipse Page
Werner Heisenberg (1901-1976) (American Institute of Physics History Center exhibit)
West Texas Astronomers (Midland, Texas)
Whispers from the Cosmos (One of the best Radioastronomy sites in the Web,
part of NCSA's Multimedia Online Expo, Science for the Millennium,
a "pavilion" of the Internet 1996 World Exposition)
Wide-Field Infrared Survey Explorer (WISE) (launched December '09)
Windows to the Universe (University of Michigan)
William M. Briggs, Statistician (Adjunct Professor of Statistical Science, Cornell University, Ithaca, New York)
WIYN Observatory (Kitt Peak)
W. M. Keck Observatory (Mauna Kea, Hawaii)
World Climate (Weather, Rainfall and Temperature Data)
World History: HyperHistory Online
WorldWide Telescope (Virtual telescope, a Microsoft Web 2.0 visualization software)
World Year of Physics 2005 (with Einstein@Home BOINC project)
WW2010 - the weather world 2010 project (University of Illinois)
 - Meteorology online guides (Light and Optics, Clouds and Precipitation, Forces and Winds, Air Masses and Fronts, Weather Forecasting, Severe Storms, Hurricanes, El Niño, The Hydrologic Cycle)

Yakima Valley Astronomy Club (Bruce Perrault)
Yohkoh Public Outreach Project (images and movies of the Sun, Solar X-ray telescope satellite)

Zooniverse (Galaxy Zoo: Hubble and other citizen science online projects)

Countries (Países):

Asociación Entrerriana de Astronomía
Cielo Sur (Astronomía desde el Hemisferio Sur)
 - Ecos de un Mundo Estrellado (Programa semanal de Luis Trumper)
espacial.com (Foros del espacio y astronomía)
Espacio Profundo (Difución de la astronomía y sus ciencias conexas)
Instituto Argentino de Radioastronomía (IAR)
Liga Iberoamericana de Astronomía (LIADA)
 - Revista Universo Digital - Liga Iberoamericana de Astronomía (LIADA)
Met.net (Clima y Meteorología)
Observatorio Astronómico de Córdoba (OAC) Universidad Nacional De Córdoba
Planetario Carl Sagan (Planetario Móvil)
Sur Astronómico

Anglo-Australian Observatory
Astronomical Society of South Australia
Astrophotography by Brad Moore (Southern Hemisphere Celestial Marvels)
Cosmodome (MirrorDome Mobile/Fixed Planetarium Projection System)
Einstein Light (Relativity: Einstein's theory in animations and film clips, University of New South Wales)
Gordon Garradd's Astronomy Page
Grove Creek Observatory (Steven Williams)
High Resolution Lunar and Planetary Imaging (Zac Pujic)
Mount Stromlo & Siding Spring Observatories (Australian National University)
The Mars Society - Australia

International Meteor Organization (IMO)
La Terre, le grand aimant - De Magnete, W. Gilbert (David P. Stern, Française)
Solar Influences Data Analysis Center (SIDC) (Royal Observatory of Belgium)

Laboratório Nacional de Astrofísica (MCT)
Liga Iberoamericana de Astronomía (LIADA)
Revista Latino-Americana de Educación en Astronomía (RELEA) (en Portugués, Castellano e Inglés)
SciELO.org (Scientific Electronic Library Online)
Southern Astrophysical Research (SOAR) Telescope

Astronomy at the University of British Columbia
Auriga Imaging (RegiStar, Automatic image registration for astrophotography)
Canadian Galactic Plane Survey (CGPS)
Canadian Hurricane Centre (CHC)
Canadian Institute for Theoretical Astrophysics (CITA)
Canadian Space Agency (CSA)
Edmonton Centre of The Royal Astronomical Society of Canada
Geological Survey of Canada (GSC) - Geomagnetism
    GSC Magnetic Declination Calculator
Les Neuf Planètes (Bill Arnett)
Liquid Mirror Telescopes (University of British Columbia)
Mike Boschat's Astronomy Page
Microvariability & Oscillations of STars (MOST) (Canada's First Space Telescope)
Space Weather Canada / Météo Spatiale Canada
The Royal Astronomical Society of Canada (La Société Royale d'Astronomie du Canada)

Círculo Astronómico
European Southern Observatory (ESO) Paranal Very Large Telescope Interferometer (VLTI). La Silla Observatory. Atacama Large Millimeter Array (ALMA).
 - New Technology Telescope (NTT)
 - Very Large Telescope (VLT)
 - European Extremely Large Telescope (E-ELT) (project)
Gemini Observatory (Mauna Kea, Hawaii & Cerro Pachón, Chile)
Liga Iberoamericana de Astronomía (LIADA)
Observatorio Astronómico Melaga
Turismo Astronómico en Chile

Science in China (Scientists, Astronomy, Archeology, Mathematics)
Yeiht (Quanzhi Ye)

Astronomía Autodidacta
Liga Iberoamericana de Astronomía (LIADA)
Observatorio Astronómico Universidad Sergio Arboleda

Costa Rica:
Asociación Costarricense de Astronomía
Fundación CIENTEC
Fundación MarViva (Protecting Marine Paradises - Protegiendo Paraísos Marinos)
Liga Iberoamericana de Astronomía (LIADA)

Astronomía Amateur Cubana (por Carlos Alberto Heredero Gracia)
Observatorio Astronómico - Universidad de La Habana

DTU Space - National Space Institute (NSI) (Technical University of Denmark)
Tycho Brahe Planetarium

Agencia Espacial Civil Ecuatoriana (EXA) (Satélite NEE-01 Pegaso, Abril 26 '13)

El Salvador:
Asociación Salvadoreña de Astronomía (ASTRO)
Liga Iberoamericana de Astronomía (LIADA)

Agencia Estatal de Meteorología (AEMET)
Agrupación Astronómica de Gran Canaria (Víctor R. Ruíz)
Agrupación Astronómica de Tenerife
Astronomía Digital (info.astro) Revista internacional de astronomía en Español (Víctor R. Ruíz)
Astronomía en Internet (Cómo usar el Internet para aprender a observar el cielo y a elegir un telescopio)
AstroRED (Alex Dantart)
Consejo Superior de Investigaciones Científicas (CSIC)
Cursillo de Astronomía (Jordi Mas)
Departamento de Astrofísica - Universidad Complutense de Madrid (UCM)
educa-ciencia.com (Ciencia y Astronomía para la educación)
El Ojo en el Cielo (Francisco Rodríguez Bergali)
Elsegundoluz.com (Revista de Astronomía, Astrofísica y Exploración Espacial)
El Universo y el hombre (Jaime Escobar Morales)
Estudio y Reconstrucción de la Gnomónica Hispanomusulmana
Gran Telescopio Canarias (GTC) (Observatorio del Roque de los Muchachos, La Palma, España)
Grup d'Estudis Astronòmics (GEA) (en Castellano)
info.astro (Víctor R. Ruíz, Agrupación Astronómica de Gran Canaria)
Instituto de Astrofísica de Canarias
Instituto Nacional de Técnica Aeroespacial (INTA)
Liga Iberoamericana de Astronomía (LIADA)
Los Nueve Planetas (AstroRed, Original de Bill Arnett)
El tiempo (Meteored, información, previsión, y predicción meteorológica)
Noticias de la Ciencia y la Tecnología / Noticias del Espacio
Observatori Astronòmic de Mallorca
Observatorio Astronómico Municipal Monte Deva - Gijón
Planetario de Pamplona
Red de Investigación sobre Bólidos y Meteoritos (SPMN)
Sociedad Astronómica Asturiana Omega
Sociedad Astronómica de España y América (SADEYA)
Sociedad de Observadores de Meteoros y Cometas de España (SOMYCE)
Starlight (Starlight Initiative for the night sky / Iniciativa Starlight para el cielo nocturno)
Vistas del Sistema Solar (Calvin J. Hamilton) Castellano
www.TuTiempo.net (Información meteorológica de todo el mundo)

Finnish Amateur Astronomy Home Page (Veikko Mäkelä, Mika Pirttivaara)
Polar Image Atmospheric Phenomena (Pekka Parviainen)

Astrophotography - Thierry Legault (High Resolution CCD Imaging, Française/English)
Cartes du Ciel - Sky Charts Free Astronomy software, Celestial atlas (Patrick Chevalley, con versión en Castellano)
Centre de Données astronomiques de Strasbourg (CDS)
 - Simbad Astronomical Database
 - VizieR Astronomical Catalog Service
 - The Aladin Interactive Sky Image Atlas
 - Astro Web Astronomical Internet Resources, AstroWeb Consortium
Computer Aided Astronomy (C2A) Planetarium software, Freeware (MS Windows)
Institut de Mécanique Céleste et de Calcul des Éphémérides (IMCCE) (Française/English)
Regards sur le Système Solaire (Calvin J. Hamilton)
Sundials Shadows - Design sundials and astrolabes (Française/English) François Blateyron. Freeware (MS Windows)
Astrium GeoInformation Services: Satellite maps & images - geospatial solutions (SPOT Satellites)
Virtual Moon Atlas Free Astronomy software, Moon observation or survey (Patrick Chevalley, Christian Legrand, English version, con versión en Castellano)
WinStars Shareware planetarium software (MS Windows, Franck Richard)

Ansichten des Sonnensystems (Calvin J. Hamilton) German
Astronomiae Historia / History of Astronomy (Wolfgang R. Dick)
Axel Mellinger's Astrophotography Page (Photograph of the whole Milky Way and Virtual Reality Milky Way Panorama)
Einstein Online (English version, Max Planck Institute)
German Aerospace Center (DLR) (English version)
 - ROentgen SATellite (ROSAT) Mission (All-sky survey of X-ray sources, 1 June 1990 - 12 February 1999)
Heavens-Above (Sky and Satellite Visibility)
International Occultation Timing Association - European Section (IOTA-ES)
Max Planck Society (English version)
Physics and Astronomy ("Sun, Earth and Moon" and Multiwavelength Messier Museum)
The Munich Astro Archive (Christine Kronberg)
vb-Planetarium An easy PC Planetaruim for beginners. Freeware (MS Windows, Astroexcel)

Indian Space Research Organisation
Chandrayaan-1 Understanding the moon (high-resolution remote sensing satellite)

Astronomy Ireland (David Moore)

Agenzia Spaziale Italiana (ASI)
Asteroid Information Services (Space Mechanics Group, Department of Mathematics, University of Pisa)
 - Asteroids Dynamic Site (AstDyS)
 - Near Earth Objects Dynamic Site (NEODyS)
Astrofili.org (Portale per l'astronomia in Italia, Fabio De Sicot)
Astrophotography (Lorenzo Lovato)
Bellatrix Astronomical Observatory (Gianluca Masi)
Cielo e Terra ["Sky Draw - Mappa del Cielo", "Earth Map - Mappa della Terra", "Eclipses & Earth - Eclisse e Terra", "Planetarium - Planetario"] (Piero Massimino, CAO)
Circolo Astrofili Talmassons
Dagli astronomi alle astronavi (David P. Stern)
Institute and Museum of the History of Science - Florence
International Supernovae Network (Stefano Pesci)
inquinamentoluminoso.it (by Pierantonio Cinzano)
Istituto di Radioastronomia (IRA), Bologna (INAF)
Istituto Nazionale di Fisica Nucleare (INFN)
Osservatorio Astrofisico di Catania (CAO)
Nico Lonetti - ASTRONOMIA
The Abdus Salam International Centre for Theoretical Physics (ICTP)
The Nine Planets - Versione italiana (Bill Arnett)

Astro Arts
Astronomy in Japan Page (Steven Renshaw)
Hayabusa Project Science Data Archive (Samples from asteroid 25143 Itokawa, 2003-2010)
Hinode (Solar-B) Science Center at NAOJ
Ikufumi Makino - Comets
Institute of Space and Astronautical Science (ISAS)
Japan Aerospace Exploration Agency (JAXA)
Seiichi Yoshida's Home Page (Comets and the MISAO Project)
Taki's Home Page (Telescope making and visual observation of deep sky objects, Free 8.5 Mag Star Atlas)

Jordanian Astronomical Society (Mohammad Shawkat Odeh)

Institute of Astronomy University of Latvia

The Astronomical Society of Malta

Area de Astronomía en la Universidad de Sonora
Club de Astronomía Mexitli
Kosmos Scientific
 - El Cielo Nocturno
Liga Iberoamericana de Astronomía (LIADA)
MegaCosmos (Jesús Gerardo Rodríguez Flores)
Sociedad Astronómica de Aguascalientes (SAA)
Sociedad Astronómica del Planetario Alfa
Xosmos Astronomia Amateur desde el Observatorio Las Palmas, Hermosillo, Sonora

ClearSkies.NL (Free Guides & Tours of the sky, Victor van Wulfen)
Dutch Open Telescope (DOT) (Observatorio del Roque de los Muchachos, La Palma, Spain)
Hallo northern sky (HNSKY) Planetarium program with 10607 deepsky objects and all stars to magnitude 12, and with the original GSC CD-ROM's, GSC-ACT or the USNO to magnitude 15 or more. Displays all planets, the Moon, Sun, moons of Saturn and Jupiter, Mars, Uranus and Neptune and a few hunderd asteroids and comets. By Han Kleijn. Freeware (MS Windows)
Netherlands Institute for Radio Astronomy (ASTRON) (Westerbork and LOFAR Synthesis Radio Telescopes)
The Maya Astronomy Page (Michiel Berger)
The Virtual Tour of the Sun (Michiel Berger)

Institute of Theoretical Astrophysics, Oslo
UNEP-GRID-Arendal (Environmental Knowledge for Change)

Centro Paraguayo de Informaciones Astronómicas (CPIA)
Liga Iberoamericana de Astronomía (LIADA)

La Astronomía en el Perú
Liga Iberoamericana de Astronomía (LIADA)

Liga Iberoamericana de Astronomía (LIADA)
Os Nove Planetas
Pedro Ré's Astronomical CCD Imaging

República Dominicana:
Liga Iberoamericana de Astronomía (LIADA)
Sociedad Astronómica Dominicana (SAD)

The Night Sky This Week (Information about the night sky and articles on astronomical topics. Emil Neata)

Institute of Applied Astronomy, St. Petersburg (IAA)
Russian Space Science Internet Web Server
Space Research Institute (IKI) (Russian Academy of Sciences)
StarCalc Astronomy planetarium & star mapping program by Alexander Zavalishin. Freeware (MS Windows)

The MacTutor History of Mathematics

South Africa:
Cederberg Astronomical Observatory (CAO)
South African Astronomical Observatory (SAAO)
Southern African Large Telescope (SALT)
Willie Koorts's Astronomy Telescope Making and Satellite Tracking Pages

Institute for Solar Physics [Swedish 1-m Solar Telescope (SST)] (El Roque de los Muchachos, La Palma, Spain)

CalSKY - The Calculated Sky On-line Configurable Astronomical and Space Calendar
European Organization for Nuclear Research (CERN)
 - The Large Hadron Collider (LHC)
Fourmilab - Index Librorum Liberorum (John Walker)
The Particle Detector BriefBook (Rudolf K. Bock, CERN)

ASTROMETRIA (Measuring temporary shape and diameter variations of the Sun and total solar irradiance. Pulkovo Observatory)
Astronomy and Space Physics Department (Kyiv National Taras Shevchenko University)
 - Celestial calendar
 - Computer Ephemeris

United Kingdom:
Armagh Observatory
Astronomy Now Online
Atmospheric Optics (Les Cowley)
BBC Radio 4 - Programmes categorised as Factual: Science & Nature
British Astronomical Association
Cambridge Astronomy
Cambridge Physics (Cavendish Laboratory outreach)
Cardiff University School of Physics and Astronomy
Cambridge Conference Network (CCNet) (Geological and historical NEO-catastrophism)
Faulkes Robotic Telescopes Project
Foundations to Chemistry (Adapted from Chemistry, Matter and the Universe)
h2g2 - The Guide to Life, The Universe and Everything (The Hitchhiker's Guide to the Galaxy, a Douglas Adams creation)
Jodrell Bank Observatory
Noble Dane: Images of Tycho Brahe (Museum of the History of Science, Oxford)
Royal Observatory Greenwich
ScopeTest.com (Ade Ashford)
Stephen Hawking
Sundials in the Internet
The Astronomer Magazine
The Climate Group (to put the world on track for a low carbon economy reducing greenhouse gas emissions)
The Royal Society
  Trailblazing (An interactive timeline of science)
The Sky at Nigth (Sir Patrick Moore, BBC Online)
The Society for Popular Astronomy (SPA)
Tony Helyar's Sundial Page (and The Equation of Time)
UCL Astrophysics Group
Zarya (Soviet, Russian & International Spaceflight)

United Nations:
Office for Outer Space Affairs
Universe Awarness for Young Children (UNAWE)

Asociación de Aficionados a la Astronomía - Uruguay (AAA)
Astroplaneta (Martín Dutra)
Liga Iberoamericana de Astronomía (LIADA)
Observatorio Astronómico Kappa Crucis

Caracas Astronómica (Marcelo Saavedra)
Centro de Investigaciones de Astronomía (CIDA) Observatorio Nacional Llano del Hato, Edo. Mérida
Centro virtual de Meteorología (CvM), Astronomía de Venezuela (Raúl Padrón)
Desde el patio de mi casa (Astrofotografía, Rafael Pire)
Dirección de Hidrografía Nacional - Observatorio Naval Cagigal
Gregorio E. Drayer A., Mg.
Liga Iberoamericana de Astronomía (LIADA)
Meteorología en Venezuela (Luis Mujica)
Observatorio ARVAL (Andrés Valencia)
Observatorio Rofh (Franz Hernández)
Observatorio Tayabeixo Asociación Larense de Astronomía (ALDA)
Sociedad Mundial del Futuro Venezuela (SMF Venezuela)

Observatorio ARVAL - Astro Links fue actualizada en (was updated on): Marzo (March) 1 '14

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